Improvement in molds for casting tires



UNrrED STATES PATENT @Trice J ANE BROOKE, OF JERSEY CITY, NEV JERSEY, ADMINISTRAIRIX OF vVILLI-AM BROOKE, DECEASED.

IMPROVEMENTIN IVIOLDS FOR CASTING TIRES.

. Specil'cation forming part of Letters Patent No. 39,3 E (i, dated July Q1, ISGS.

To all whom it may concern:

Be it known that WILLIAM BROOKE, deceased, late of Jersey City, in the cmnty of Hudson and State of New Jersey, was the inventor of a new and useful Improvement in Molds for Casting Tires and Rings of Steel, Iron, or other Metal; and I, J NE BROOKE, of the same city, county, and State, administratriX of the estate ot' the said W'ILLIAM BROOKE, do hereby declare that the following 'is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specica-tion, in which- Figure l is a plan of a mold for casting locomotive-tires, having the cap of the core removed to show the interior. Fig. 2 is a central Vertical section of the mold'in the plane indicated by the line .c x of Fig. l. Fig. 3 is a central vertical section of the same in the plane indicated by the line y 1/ in Fig. 1. Fig. 4 is a plan of the bottom plate of the mold.

Similar letters of reference indicate corresponding parts in the several Iigures.

This invention consists, rst, in fitting a mold for casting tires, rings, or bands of steel or iron or other metal with a metal e'ore so constructed as to be capable of contraction automatically, as required, to permit the -natural contraction of the casting in cooling, and in so constructing such core that it maybe loosened inthe casting by the force applied to lift it to withdraw it therefroni.

It also consists in so constructing the gates of the mold, both those for pouring and those for the escape ot' air, open to the core, or so that the core constitutes one side ot' cach gate, by which means the metal left in the gates is prevented from interfering with the contraction of the casting.

It further consists in providing for an overk iow from the pouring-gates at a level lower than the mouths of the air-gates, for the purpose of preventing the metal in the pouringgates from cutting into the core, and of permitting the cover or cope of the mold to be drawn without difficulty.

To enable others skilled in the art to make and use the invention, I will proceed to describe its construction and operation.

A is a horizontally-arranged ring or annular plate, of cast-iron or other metal, forming the bottom of the mold. B is a second ring ofthe same material, forming the sides of the same, and C a third ring of the same material, forming the cover or cope of the same. The cope C is divided across the center into two parts, which are hinged together at a tov enable it to be opened, and it is furnished opposite to the hinge a with lugs b b, on each half fitted together and drilled for the reception of a pin, c, by which to secure the ring in a closed condition. The holes in the said lugs may be so arranged that by making the pin c elliptical in its transversesection, as shown in Fig. l, the turning of the said pin in the holes may be caused to produce a slight contraction and expansion of the ring, and to enable the pin to be thus used it is furnished with a 1ever, c. The ring B is iitted to an annular projection, d, on the ring a, and the cope O to an annular projection,e,o11 the ring B, and in thisway the several rings are kept concentric with eachother and the proper form of the mold is preserved. The rings are fitted with steady-pins to prevent them from turning on each other. a

rlhe contracting core is composed of any suitable number of segments, D D, of castiron or other metal, and a corresponding number of interposed wedges, E E, of the same material, the whole combining to form a hollow cylinder, and fitted with a base-plate, F, and cap-plate G, which are secured together by shouldered screw-bolts f f and nuts g g at such distances apart as to j ust permit the segments and wedges to work freely toward and from the center to produce the'cont'raetion and expansion ot the core. The inner faces ot the said base and cap plates F and Cr are rccessed, as shown at h 7L in Figs'2 and 3, to'receive projections /f t on the bottom and top ol' the segments and wedges, and prevent the said segments and wedges from falling out ot' the core or expanding more than is necessary. The plates F and G are bored centrally for the reception of a mandrel or shaft, H, which is fitted to work easily within the said holes, and passes directly through the core, and this shaft has iirmly secured to it within the core two cross-heads jj, which are severally connected with the wedges by means of links I I,

arranged in such manner (shown in Fig. 3) as tracts, the portions of metal left in the gates to act like toggles and to force out the wedges from the center of the core by the downward movement of the shaft, and draw them toward the center by the upward movement of theA same. The outward movement of the wedges forces apart the segments, and so produces the expansion of the core in all directions, and the inward movement of the wed ges permits the segments to approach each other again and produce the contraction of the core. The shaft H is furnished at the top with a shackle, K, by which to suspend or lift it by a derrick orother means, and at the bottom with a shackle, J, from which to suspend weights to produce and maintain the expansion of the core. The core thus constructed is fitted into a shallow seat, 7c k, provided for its reception in the bottom piece, A, of the mold, and its upper part fits into the cope C above the cavity of the mold in which the casting L (shown in red color in Figs. l and 2) is produced.

To place the core in the mold it is suspended by the shackle K, and the weight of the core causes it to slip down the shaft H, which is equivalent to moving the shaft upward in the core, and the links are thereby caused to draw the wedges inward upto the arms of the crosshead j, and leave the segments loose and free to move inward. Zhen the core has been deposited in the mold, which is placed over a pit, the shaft H is left free, and a weight is suspended from the lower shackle, J', to draw the shaft H downward, and thereby cause the wedges to be forced outward and the core to be expanded toits full size-that is to say, till it its tightly into the portion of the interior of the cope C above the mold-cavity.

\Vhen the metal of which thetire or ring` is to be cast has been poured, and as the casting cools, its natural contraction produces suffi-4 cient pressure around the whole circumference of the core to overcome the pressure of the weight suspended from the shackle J, and so cause the contraction of the core with the casting. The resistance to contraction is graduated by the amount of weight suspended from the shaft, and this should be sufficient to insure the uniform contraction all around the core. Then the core is to be removed-from the casting, it is lifted by the shackle K, and the shaft H,bein g first drawn upward withinit, draws in the wedges, and so loosens the core in the casting. a

Z Z are the pouring gates, and m m the airgates, as many as may be desirable, each consisting of a groove formed in the upper part of the inner periphery of the cope C, and all open to the core, so that one side of each gate is formed by the core itself, as will be seen by reference to Figs. l. and 2. It will be readily understood that as the casting conwill move with the body of the casting-that is to say, follow the surface of the coreand so offer no obstacle to the contraction of the casting.

n n are the overflow-channels from the pouring-gates Z Z, arranged at a lower level than the mouths of the air-gates, which are at the top of the cope C.

In order to prevent the inner sides of the portions of metal left in the gates from being flush with the inner face of the casting. and thereby likely to cause the said face to be injured in breaking off the said portions, the core is made somewhat larger above the part around which the casting L is performed, as

shown at p in Figs. 2 and 3. This brings the gates away from the inner face of the mold formed by the portion of the core which is within the mold.

q y q, Figs. 2 and 4, are pieces of plumbago. soapstone, or other refractory material tted into the mold and core opposite the pouring gates, where the molten metal is first received', to preventl the mold from being defaced or the casting from sticking to it at those points.

In order to insure the pieces g q in the core being opposite the pouring-gates, a steady-pi n. o', Fig. l, is secured in the core, and a notch, s, provided in the cope C for its reception.

A strong spring or springs might be applied within the core as a substitute for the toggles, and made to produce the same results.

What I claim as the invention of XVILLLrM BROOKE, deceased, and desire to secure by Let4 ters Patent, is-

1. Fitting a moldfor casting tires, rings, or bands of steel or iron or other metal with a metal core which is so constructed as to be capable of contracting automatically, as required, to permit the natural contraction of the casting in cooling, substantially as herein specified.

2. So constructing the metallic core that it may be loosened in the casting by the force applied to lift and withdraw it from the casting, substantially as herein described.

3. The arrangement of the pouring -gaies and air gates of the mold between the core and the body of the mold, so that one side of each gate is formed by the surface ofthe core, substantially as and for the purpose herein specified.

4. Providing an overflow from the pouring gates at a level lower than the mouths of the airgates, substantially as and for the purpose herein specified.

JANE BROOKE, Admin/stmtrfix Q/i the @stufe of ll'ZZ/mn Brotkc,

deceased.

\Vitnesses:

M. S. Pan'rnrncu, lt. lflf. LoUDuN. 

